Video is not remotely funny,neither is it educational.The one thing it isn't though is the full recording.

I wonder what is said and done after this 1.52 minutes.Could be a case of some selective editing.
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Maybe. Or maybe he's not good at humour, or has just lost his marbles.

Either way, I expect more silly videos in the coming weeks due to boredom from the lockdown.

He's not a very talented boxer, he's just a good boxer with an average resume and has had some stinking performances during the last 3 years. Hasn't beaten anyone of note either. Even if you discount his smoke and mirrors boxing career, his behaviour outside of the ring is deplorable and has been for years.